Abstract
A fish school is considered as a typical example of autonomous decentralized system (ADS) or a self-organizing system existing in nature, because it often shows a high degree of coordinative behavior in the absence of a leader. A mathematical model was proposed in our earlier paper to describe the behavior of a homogeneous fish school which consists of individuals with almost the same character. In this paper, another model is proposed to describe the behavior of a heterogeneous fish school, in which there exist individuals with different characters. Since the behavior of a fish school varies with environmental variations, simulations are carried out by setting a box-shaped trap in a behavior space as an obstacle. The self-organization of the school and the variations of moving pattern with changing the quantity of information exchange among individuals are discussed.
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